added warning about installing and ensure can only install workstation on centos

salt/workstation/remove_gui.sls

@@ -1,5 +1,15 @@
+{# we only want this state to run it is CentOS #}
+{% if grains.os == 'CentOS' %}
+
 remove_graphical_target:
   file.symlink:
     - name: /etc/systemd/system/default.target
     - target: /lib/systemd/system/multi-user.target
     - force: True
+
+{% else %}
+workstation_trusted-ca_os_fail:
+  test.fail_without_changes:
+    - comment: 'SO Analyst Workstation can only be installed on CentOS'
+
+{% endif %}